fix(download): preserve finalization metadata and library labels

test/models_and_utils_test.dart

@@ -1305,6 +1305,14 @@ void main() {
       );
     });
 
+    test('treats generic M4A container reports as inconclusive codecs', () {
+      expect(isInconclusiveAudioCodec(null), isTrue);
+      expect(isInconclusiveAudioCodec('m4a'), isTrue);
+      expect(isInconclusiveAudioCodec('MP4'), isTrue);
+      expect(isInconclusiveAudioCodec('flac'), isFalse);
+      expect(isInconclusiveAudioCodec('aac'), isFalse);
+    });
+
     test('uses m4a for ISO-BMFF audio except AC-4 passthrough', () {
       expect(isoBmffAudioExtensionForCodec('opus'), '.m4a');
       expect(isoBmffAudioExtensionForCodec('ec-3'), '.m4a');

test/queue_library_refresh_policy_test.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:flutter_test/flutter_test.dart';
 
+import 'package:spotiflac_android/models/settings.dart';
 import 'package:spotiflac_android/screens/queue_library_refresh_policy.dart';
 import 'package:spotiflac_android/services/library_database.dart';
 
@@ -108,6 +109,82 @@ void main() {
     );
   });
 
+  test(
+    'completion bridge survives partial album cancellation until landing',
+    () {
+      expect(
+        shouldRetainCompletionBridge(
+          isRequeued: false,
+          hasActiveDownloads: false,
+          libraryRowLanded: false,
+          hasHistoryItem: true,
+          expired: true,
+        ),
+        isTrue,
+      );
+      expect(
+        shouldRetainCompletionBridge(
+          isRequeued: false,
+          hasActiveDownloads: false,
+          libraryRowLanded: true,
+          hasHistoryItem: true,
+          expired: true,
+        ),
+        isFalse,
+      );
+    },
+  );
+
+  test('unpersisted completion bridge retains only its short grace period', () {
+    expect(
+      shouldRetainCompletionBridge(
+        isRequeued: false,
+        hasActiveDownloads: false,
+        libraryRowLanded: false,
+        hasHistoryItem: false,
+        expired: false,
+      ),
+      isTrue,
+    );
+    expect(
+      shouldRetainCompletionBridge(
+        isRequeued: false,
+        hasActiveDownloads: false,
+        libraryRowLanded: false,
+        hasHistoryItem: false,
+        expired: true,
+      ),
+      isFalse,
+    );
+  });
+
+  test('completion bridge fallback follows the current label mode', () {
+    expect(
+      buildCompletionBridgeFallbackQualityLabel(
+        mode: AppSettings.libraryQualityLabelFileFormat,
+        completedItemFilePath: '/music/completed.flac',
+        storedQuality: '24-bit/96kHz',
+      ),
+      'FLAC',
+    );
+    expect(
+      buildCompletionBridgeFallbackQualityLabel(
+        mode: AppSettings.libraryQualityLabelBitDepthOnly,
+        completedItemFilePath: '/music/completed.flac',
+        storedQuality: '24-bit/96kHz',
+      ),
+      '24-bit',
+    );
+    expect(
+      buildCompletionBridgeFallbackQualityLabel(
+        mode: AppSettings.libraryQualityLabelBitrate,
+        completedItemFilePath: '/music/completed.flac',
+        storedQuality: '24-bit/96kHz',
+      ),
+      isNull,
+    );
+  });
+
   test(
     'completion probe falls back from stale history to completed path',
     () async {